My GTI had the AXX engine in that used to idle like it had lairy cams ,
This engine dropped its thrust bearings so now have a Audi S3 BHZ engine fitted with all the AXX sensors and ancillaries.
This engine does the same, it has a different map now (stage 3 revo K04 file)
Its so lumpy its not right
I have the forge catch can so no PCV issues, i have checked for air leaks and the vacuum in 0.8 bar at idle.
New iridium plugs , new MAF , APR fuel pump ,New in tank fuel pump. cam lobe and follower are fine, N80 purge valve works fine. cant find any air leaks , all boost pipework is new / silicone.
Dump valve is sealing and perfect
What else could cause this im kinda stuck now
The idle is around 700-750 RPM